Furnace



Nov. 4 1924.

I 1,514,342 I C. J. RINGSTROM FURNACE F ilea-N v. 26. 1923 HIM 1 5 Patented Nov. 4, 1924.

idttiTfiiii inane arms.

CHARLES J. nlnesrrnoiu, or crrroeeo, ILLINOIS.

FURNACE.

Application filed November 26, 1923 provements in furnaces, but has particular I relation to that class of furnaces used in the process of case-hardeningmetallic articles, and it consists in certain peculiarities of the construction, novel arrangement and combination of parts thereof as will be hereinafter more fully set forth and specifically claimed.

The object of the invention is toprovide a case-hardening furnace of such construction and arrangement of its parts, that much time and labor employed in performing the necessary and different steps required in the art or process of casehardening. will be saved by its use, over that of the old style or commonly used furnaces for the same purpose, or in other words, to furnish a furnace by means of which case-hardening can be more readily, conveniently and efliciently done than ordinarily, and in such a way, that a great saving in the quantity of the chemicals composing or incorporated in the baths to which the articles to be case-hardened, must be subjected, will be effected.

In the accompanying drawing, which serves to illustrate an embodiment of the invention,

Figure l is a central longitudinal sec tional view of the furnace showing it mounted on a supporting frame therefor; and

Fig. 2 is a cross-sectional view taken on line 2-2 of 1 looking in the direction indicated by the arrows.

The supporting frame for the furnace is designated as a whole by the numeral 5 and may be made of any suitable size and form, but by preference of an elongated rectangular shape as shown. This frame is supported at its corners by legs 6 of such height or length as to cause the horizontally disposed top 7 of the frame to be located at such a distance from the floor as to render convenient access to the furnace, which is mounted on the said horizontally disposed portion of the frame. A rectangular box like casing 8 having its upper end open is mounted on the top of the frame 5 and if Serial No. 67$;967.

desired, secured thereto inany suitable way.

This casing is lined withbrick 9 or other refractory material, thereby providing a rectangular cavity, the upper portion of which is closed by an arched wall 10 of brick or other suitable material. of the cavity of the furnace is inclined from each end thereof towards its medial line, but each of the inclined portions 11 constituting the 'floor terminates short of the medial line between the endsof the furnace, thereby providing a recess 12 for the.

reception of a container 13, which isby preference rectangular in shape and made, of :hre bItJClKQC-Oltllldlllll, (commonly called The floor carborundum), or any other suitable are: p

fractory material. This container is of such depth that when placed between the adjacent walls of the inclined surfaces 11, con-H stituting the floor of the furnace, its rim or upper edge will be about flush with the upper surface of the adjacent edges of said inclined portions, as is clearly shown in the drawing. Above the inclined portions 11, one, or if desired, both of the side walls of the furnace is or may be provided with a pair of openings lt and 15, which are by preference located in the same horizontal plane and have their inner ends disposed directly above the adjacent walls of the recess 12 in which the container 18 is located.

By preference, one of the end walls of the furnace is provided with an opening 16 communicating with its cavity for permit ting access thereto. Each of these openings may be provided with doors, not shown, and it is obvious that the furnace may be equipped with a hood and outlet therefrom for the collection and the discharge of fumes emanating from the cyanide or other suitable material held by the container 13 for the purpose of providing baths for the articles to be case-hardened, but as the hood and its outlet may be of the ordinary con struction, and forms no part of my present invention, it has not been deemed necessary to show the same in the drawing.

The furnace may be heated in the usual way or by any suitable means but prefer ably, by means of gas or oil injected into the furnace through the opening 16 thereof, and it is apparent that by means of my improved construction, the article or articles to be case-hardened maybe inserted through one of the openings, say the opening 14, in a side wall of the furnace and placed on the inclined portion 11 of the floor directly under said opening where the article or articles may be allowed to remain until preheated to the requisite or desired degree, when by employing a suitable implement inserted through the said opening, the article or articles can be readily slid on the said inclined surface into the bath held by the container 13 and permitted to remain in said bath for a desired period, after which the article or articles may be removed from the container and bath by means of a suitable implement preferably inserted through the opening 15 on to the inclined portion 11 of the floor directly under the last named opening, where the article or articles may be further subjected to the heat of the furnace, and where the cyanide or other liquid in which the article or articles have been submerged will be drained from the articles and back into the receptacle 18 for reuse. From the lastnamed position, the article or articles can be removed by the employment of the requisite kind of .an implement through the opening 15 in one of the side walls of the furnace. The container 13 is made to fit the recess 12 in the floor of the furnacesnugly, yet in such a way that in the event the container becomes defective from usage, it can be removed without disturbing the inclined portions of the floor and can be replaced by a new one. This removal of the container, should it be desired, can be effected by removing a portion of the arched wall or cover of the furnace.

Having thus fully described my inven tion, what I claim as new and desire to secure by Letters Patent is:

1. A furnace of the class described having a floor provided with oppositely inclined and spaced surfaces and having means for access thereto, and an upwardly open removable container located between the adjacent edges of said surfaces with its i upper edge substantially flush therewith.

2. A furnace of the class described having a floor provided with portions inclined towards each other and terminating at their adjacent edges in a substantially rectangular shaped depression or pit, and an upwardly open removable container corresponding in shape to said pit with its walls in contact with the walls of the latter and having its upper edge substantially flush with the adjacent edges of said inclined portions, said furnace having means for access as well as admission of heat thereto.

CHARLES J. RINGSTROM. 

